Added an equals and hashcode implementation for AffineTransform RND-756

Author: michaeldemey

kernel/src/main/java/com/itextpdf/kernel/geom/AffineTransform.java

@@ -44,6 +44,7 @@ This file is part of the iText (R) project.
 package com.itextpdf.kernel.geom;
 
 import java.io.Serializable;
+import java.util.Objects;
 
 public class AffineTransform implements Serializable {
 
@@ -631,4 +632,27 @@ public void inverseTransform(float[] src, int srcOff, float[] dst, int dstOff, i
     public AffineTransform clone() throws CloneNotSupportedException {
         return new AffineTransform(this);
     }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o)
+            return true;
+
+        if (o == null || getClass() != o.getClass())
+            return false;
+
+        AffineTransform that = (AffineTransform) o;
+
+        return Double.compare(that.m00, m00) == 0 &&
+                Double.compare(that.m10, m10) == 0 &&
+                Double.compare(that.m01, m01) == 0 &&
+                Double.compare(that.m11, m11) == 0 &&
+                Double.compare(that.m02, m02) == 0 &&
+                Double.compare(that.m12, m12) == 0;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(m00, m10, m01, m11, m02, m12);
+    }
 }

kernel/src/test/java/com/itextpdf/kernel/geom/AffineTransformTest.java

@@ -0,0 +1,53 @@
+package com.itextpdf.kernel.geom;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class AffineTransformTest {
+
+    @Test
+    public void selfTest() {
+        AffineTransform affineTransform = new AffineTransform();
+
+        Assert.assertTrue(affineTransform.equals(affineTransform));
+    }
+
+    @Test
+    public void nullTest() {
+        AffineTransform affineTransform = new AffineTransform();
+
+        Assert.assertFalse(affineTransform.equals(null));
+    }
+
+    @Test
+    public void otherClassTest() {
+        AffineTransform affineTransform = new AffineTransform();
+        String string = "Test";
+
+        Assert.assertFalse(affineTransform.equals(string));
+    }
+
+    @Test
+    public void sameValuesTest() {
+        AffineTransform affineTransform1 = new AffineTransform(0d, 1d, 2d, 3d, 4d, 5d);
+        AffineTransform affineTransform2 = new AffineTransform(0d, 1d, 2d, 3d, 4d, 5d);
+        int hash1 = affineTransform1.hashCode();
+        int hash2 = affineTransform2.hashCode();
+
+        Assert.assertFalse(affineTransform1 == affineTransform2);
+        Assert.assertEquals(hash1, hash2);
+        Assert.assertTrue(affineTransform1.equals(affineTransform2));
+    }
+
+    @Test
+    public void differentValuesTest() {
+        AffineTransform affineTransform1 = new AffineTransform(0d, 1d, 2d, 3d, 4d, 5d);
+        AffineTransform affineTransform2 = new AffineTransform(5d, 4d, 3d, 2d, 1d, 1d);
+        int hash1 = affineTransform1.hashCode();
+        int hash2 = affineTransform2.hashCode();
+
+        Assert.assertFalse(affineTransform1 == affineTransform2);
+        Assert.assertNotEquals(hash1, hash2);
+        Assert.assertFalse(affineTransform1.equals(affineTransform2));
+    }
+}